0.1.10: onelogin-aws-login always fail without -d $duration_seconds

[mumoshu]

The latest release of onelogin-aws-cli fails without -d $duration_seconds, emitting an error like this:

$ onelogin-aws-login -C default
Google Authenticator Token: *snip*
*snip*
Role Number: 2
Traceback (most recent call last):
  File "/Users/kuoka-yusuke/.pyenv/versions/3.6.5/bin/onelogin-aws-login", line 11, in <module>
    load_entry_point('onelogin-aws-cli==0.1.10', 'console_scripts', 'onelogin-aws-login')()
  File "/Users/kuoka-yusuke/.pyenv/versions/3.6.5/lib/python3.6/site-packages/onelogin_aws_cli/cli.py", line 55, in login
    api.save_credentials()
  File "/Users/kuoka-yusuke/.pyenv/versions/3.6.5/lib/python3.6/site-packages/onelogin_aws_cli/__init__.py", line 131, in save_credentials
    self.assume_role()
  File "/Users/kuoka-yusuke/.pyenv/versions/3.6.5/lib/python3.6/site-packages/onelogin_aws_cli/__init__.py", line 122, in assume_role
    DurationSeconds=self.duration_seconds
  File "/Users/kuoka-yusuke/.pyenv/versions/3.6.5/lib/python3.6/site-packages/botocore/client.py", line 314, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/Users/kuoka-yusuke/.pyenv/versions/3.6.5/lib/python3.6/site-packages/botocore/client.py", line 586, in _make_api_call
    api_params, operation_model, context=request_context)
  File "/Users/kuoka-yusuke/.pyenv/versions/3.6.5/lib/python3.6/site-packages/botocore/client.py", line 621, in _convert_to_request_dict
    api_params, operation_model)
  File "/Users/kuoka-yusuke/.pyenv/versions/3.6.5/lib/python3.6/site-packages/botocore/validate.py", line 291, in serialize_to_request
    raise ParamValidationError(report=report.generate_report())
botocore.exceptions.ParamValidationError: Parameter validation failed:
Invalid type for parameter DurationSeconds, value: None, type: <class 'NoneType'>, valid types: <class 'int'>

This obviously work:

$ onelogin-aws-login -C default -d 3600

But it took some time until I finally notice that it is now an implicitly required flag 😃
Is it an expected behavior? Would you mind if I brought back the default value of 3600 seconds?